658 lines
29 KiB
CMake
658 lines
29 KiB
CMake
#.rst:
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# FindMPI
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# -------
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#
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# Find a Message Passing Interface (MPI) implementation
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#
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# The Message Passing Interface (MPI) is a library used to write
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# high-performance distributed-memory parallel applications, and is
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# typically deployed on a cluster. MPI is a standard interface (defined
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# by the MPI forum) for which many implementations are available. All
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# of them have somewhat different include paths, libraries to link
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# against, etc., and this module tries to smooth out those differences.
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#
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# === Variables ===
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#
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# This module will set the following variables per language in your
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# project, where <lang> is one of C, CXX, or Fortran:
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#
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# ::
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#
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# MPI_<lang>_FOUND TRUE if FindMPI found MPI flags for <lang>
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# MPI_<lang>_COMPILER MPI Compiler wrapper for <lang>
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# MPI_<lang>_COMPILE_FLAGS Compilation flags for MPI programs
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# MPI_<lang>_INCLUDE_PATH Include path(s) for MPI header
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# MPI_<lang>_LINK_FLAGS Linking flags for MPI programs
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# MPI_<lang>_LIBRARIES All libraries to link MPI programs against
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#
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# Additionally, FindMPI sets the following variables for running MPI
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# programs from the command line:
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#
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# ::
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#
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# MPIEXEC Executable for running MPI programs
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# MPIEXEC_NUMPROC_FLAG Flag to pass to MPIEXEC before giving
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# it the number of processors to run on
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# MPIEXEC_PREFLAGS Flags to pass to MPIEXEC directly
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# before the executable to run.
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# MPIEXEC_POSTFLAGS Flags to pass to MPIEXEC after other flags
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#
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# === Usage ===
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#
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# To use this module, simply call FindMPI from a CMakeLists.txt file, or
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# run find_package(MPI), then run CMake. If you are happy with the
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# auto- detected configuration for your language, then you're done. If
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# not, you have two options:
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#
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# ::
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#
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# 1. Set MPI_<lang>_COMPILER to the MPI wrapper (mpicc, etc.) of your
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# choice and reconfigure. FindMPI will attempt to determine all the
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# necessary variables using THAT compiler's compile and link flags.
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# 2. If this fails, or if your MPI implementation does not come with
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# a compiler wrapper, then set both MPI_<lang>_LIBRARIES and
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# MPI_<lang>_INCLUDE_PATH. You may also set any other variables
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# listed above, but these two are required. This will circumvent
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# autodetection entirely.
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#
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# When configuration is successful, MPI_<lang>_COMPILER will be set to
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# the compiler wrapper for <lang>, if it was found. MPI_<lang>_FOUND
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# and other variables above will be set if any MPI implementation was
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# found for <lang>, regardless of whether a compiler was found.
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#
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# When using MPIEXEC to execute MPI applications, you should typically
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# use all of the MPIEXEC flags as follows:
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#
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# ::
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#
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# ${MPIEXEC} ${MPIEXEC_NUMPROC_FLAG} PROCS
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# ${MPIEXEC_PREFLAGS} EXECUTABLE ${MPIEXEC_POSTFLAGS} ARGS
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#
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# where PROCS is the number of processors on which to execute the
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# program, EXECUTABLE is the MPI program, and ARGS are the arguments to
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# pass to the MPI program.
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#
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# === Backward Compatibility ===
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#
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# For backward compatibility with older versions of FindMPI, these
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# variables are set, but deprecated:
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#
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# ::
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#
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# MPI_FOUND MPI_COMPILER MPI_LIBRARY
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# MPI_COMPILE_FLAGS MPI_INCLUDE_PATH MPI_EXTRA_LIBRARY
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# MPI_LINK_FLAGS MPI_LIBRARIES
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#
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# In new projects, please use the MPI_<lang>_XXX equivalents.
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#=============================================================================
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# Copyright 2001-2011 Kitware, Inc.
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# Copyright 2010-2011 Todd Gamblin tgamblin@llnl.gov
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# Copyright 2001-2009 Dave Partyka
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#
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# Distributed under the OSI-approved BSD License (the "License");
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# see accompanying file Copyright.txt for details.
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#
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# This software is distributed WITHOUT ANY WARRANTY; without even the
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# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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# See the License for more information.
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#=============================================================================
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# (To distribute this file outside of CMake, substitute the full
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# License text for the above reference.)
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# include this to handle the QUIETLY and REQUIRED arguments
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include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
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include(${CMAKE_CURRENT_LIST_DIR}/GetPrerequisites.cmake)
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#
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# This part detects MPI compilers, attempting to wade through the mess of compiler names in
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# a sensible way.
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#
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# The compilers are detected in this order:
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#
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# 1. Try to find the most generic available MPI compiler, as this is usually set up by
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# cluster admins. e.g., if plain old mpicc is available, we'll use it and assume it's
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# the right compiler.
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#
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# 2. If a generic mpicc is NOT found, then we attempt to find one that matches
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# CMAKE_<lang>_COMPILER_ID. e.g. if you are using XL compilers, we'll try to find mpixlc
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# and company, but not mpiicc. This hopefully prevents toolchain mismatches.
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#
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# If you want to force a particular MPI compiler other than what we autodetect (e.g. if you
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# want to compile regular stuff with GNU and parallel stuff with Intel), you can always set
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# your favorite MPI_<lang>_COMPILER explicitly and this stuff will be ignored.
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#
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# Start out with the generic MPI compiler names, as these are most commonly used.
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set(_MPI_C_COMPILER_NAMES mpicc mpcc mpicc_r mpcc_r)
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set(_MPI_CXX_COMPILER_NAMES mpicxx mpiCC mpcxx mpCC mpic++ mpc++
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mpicxx_r mpiCC_r mpcxx_r mpCC_r mpic++_r mpc++_r)
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set(_MPI_Fortran_COMPILER_NAMES mpif95 mpif95_r mpf95 mpf95_r
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mpif90 mpif90_r mpf90 mpf90_r
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mpif77 mpif77_r mpf77 mpf77_r)
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# GNU compiler names
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set(_MPI_GNU_C_COMPILER_NAMES mpigcc mpgcc mpigcc_r mpgcc_r)
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set(_MPI_GNU_CXX_COMPILER_NAMES mpig++ mpg++ mpig++_r mpg++_r)
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set(_MPI_GNU_Fortran_COMPILER_NAMES mpigfortran mpgfortran mpigfortran_r mpgfortran_r
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mpig77 mpig77_r mpg77 mpg77_r)
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# Intel MPI compiler names
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set(_MPI_Intel_C_COMPILER_NAMES mpiicc)
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set(_MPI_Intel_CXX_COMPILER_NAMES mpiicpc mpiicxx mpiic++ mpiiCC)
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set(_MPI_Intel_Fortran_COMPILER_NAMES mpiifort mpiif95 mpiif90 mpiif77)
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# PGI compiler names
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set(_MPI_PGI_C_COMPILER_NAMES mpipgcc mppgcc)
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set(_MPI_PGI_CXX_COMPILER_NAMES mpipgCC mppgCC)
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set(_MPI_PGI_Fortran_COMPILER_NAMES mpipgf95 mpipgf90 mppgf95 mppgf90 mpipgf77 mppgf77)
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# XLC MPI Compiler names
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set(_MPI_XL_C_COMPILER_NAMES mpxlc mpxlc_r mpixlc mpixlc_r)
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set(_MPI_XL_CXX_COMPILER_NAMES mpixlcxx mpixlC mpixlc++ mpxlcxx mpxlc++ mpixlc++ mpxlCC
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mpixlcxx_r mpixlC_r mpixlc++_r mpxlcxx_r mpxlc++_r mpixlc++_r mpxlCC_r)
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set(_MPI_XL_Fortran_COMPILER_NAMES mpixlf95 mpixlf95_r mpxlf95 mpxlf95_r
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mpixlf90 mpixlf90_r mpxlf90 mpxlf90_r
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mpixlf77 mpixlf77_r mpxlf77 mpxlf77_r
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mpixlf mpixlf_r mpxlf mpxlf_r)
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# append vendor-specific compilers to the list if we either don't know the compiler id,
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# or if we know it matches the regular compiler.
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foreach (lang C CXX Fortran)
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foreach (id GNU Intel PGI XL)
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if (NOT CMAKE_${lang}_COMPILER_ID OR CMAKE_${lang}_COMPILER_ID STREQUAL id)
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list(APPEND _MPI_${lang}_COMPILER_NAMES ${_MPI_${id}_${lang}_COMPILER_NAMES})
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endif()
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unset(_MPI_${id}_${lang}_COMPILER_NAMES) # clean up the namespace here
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endforeach()
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endforeach()
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# Names to try for MPI exec
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set(_MPI_EXEC_NAMES mpiexec mpirun lamexec srun)
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# Grab the path to MPI from the registry if we're on windows.
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set(_MPI_PREFIX_PATH)
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if(WIN32)
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list(APPEND _MPI_PREFIX_PATH "[HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\MPI;InstallRoot]/Bin")
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list(APPEND _MPI_PREFIX_PATH "[HKEY_LOCAL_MACHINE\\SOFTWARE\\MPICH\\SMPD;binary]/..")
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list(APPEND _MPI_PREFIX_PATH "[HKEY_LOCAL_MACHINE\\SOFTWARE\\MPICH2;Path]")
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list(APPEND _MPI_PREFIX_PATH "$ENV{ProgramW6432}/MPICH2/")
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endif()
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# Build a list of prefixes to search for MPI.
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foreach(SystemPrefixDir ${CMAKE_SYSTEM_PREFIX_PATH})
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foreach(MpiPackageDir ${_MPI_PREFIX_PATH})
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if(EXISTS ${SystemPrefixDir}/${MpiPackageDir})
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list(APPEND _MPI_PREFIX_PATH "${SystemPrefixDir}/${MpiPackageDir}")
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endif()
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endforeach()
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endforeach()
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function (_mpi_check_compiler compiler options cmdvar resvar)
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execute_process(
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COMMAND "${compiler}" ${options}
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OUTPUT_VARIABLE cmdline OUTPUT_STRIP_TRAILING_WHITESPACE
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ERROR_VARIABLE cmdline ERROR_STRIP_TRAILING_WHITESPACE
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RESULT_VARIABLE success)
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# Intel MPI 5.0.1 will return a zero return code even when the
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# argument to the MPI compiler wrapper is unknown. Attempt to
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# catch this case.
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if("${cmdline}" MATCHES "undefined reference")
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set(success 255 )
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endif()
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set(${cmdvar} "${cmdline}" PARENT_SCOPE)
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set(${resvar} "${success}" PARENT_SCOPE)
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endfunction()
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#
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# interrogate_mpi_compiler(lang try_libs)
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#
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# Attempts to extract compiler and linker args from an MPI compiler. The arguments set
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# by this function are:
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#
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# MPI_<lang>_INCLUDE_PATH MPI_<lang>_LINK_FLAGS MPI_<lang>_FOUND
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# MPI_<lang>_COMPILE_FLAGS MPI_<lang>_LIBRARIES
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#
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# MPI_<lang>_COMPILER must be set beforehand to the absolute path to an MPI compiler for
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# <lang>. Additionally, MPI_<lang>_INCLUDE_PATH and MPI_<lang>_LIBRARIES may be set
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# to skip autodetection.
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#
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# If try_libs is TRUE, this will also attempt to find plain MPI libraries in the usual
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# way. In general, this is not as effective as interrogating the compilers, as it
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# ignores language-specific flags and libraries. However, some MPI implementations
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# (Windows implementations) do not have compiler wrappers, so this approach must be used.
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#
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function (interrogate_mpi_compiler lang try_libs)
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# MPI_${lang}_NO_INTERROGATE will be set to a compiler name when the *regular* compiler was
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# discovered to be the MPI compiler. This happens on machines like the Cray XE6 that use
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# modules to set cc, CC, and ftn to the MPI compilers. If the user force-sets another MPI
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# compiler, MPI_${lang}_COMPILER won't be equal to MPI_${lang}_NO_INTERROGATE, and we'll
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# inspect that compiler anew. This allows users to set new compilers w/o rm'ing cache.
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string(COMPARE NOTEQUAL "${MPI_${lang}_NO_INTERROGATE}" "${MPI_${lang}_COMPILER}" interrogate)
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# If MPI is set already in the cache, don't bother with interrogating the compiler.
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if (interrogate AND ((NOT MPI_${lang}_INCLUDE_PATH) OR (NOT MPI_${lang}_LIBRARIES)))
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if (MPI_${lang}_COMPILER)
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# Check whether the -showme:compile option works. This indicates that we have either OpenMPI
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# or a newer version of LAM-MPI, and implies that -showme:link will also work.
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_mpi_check_compiler("${MPI_${lang}_COMPILER}" "-showme:compile" MPI_COMPILE_CMDLINE MPI_COMPILER_RETURN)
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if (MPI_COMPILER_RETURN EQUAL 0)
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# If we appear to have -showme:compile, then we should
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# also have -showme:link. Try it.
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execute_process(
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COMMAND ${MPI_${lang}_COMPILER} -showme:link
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OUTPUT_VARIABLE MPI_LINK_CMDLINE OUTPUT_STRIP_TRAILING_WHITESPACE
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ERROR_VARIABLE MPI_LINK_CMDLINE ERROR_STRIP_TRAILING_WHITESPACE
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RESULT_VARIABLE MPI_COMPILER_RETURN)
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if (MPI_COMPILER_RETURN EQUAL 0)
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# We probably have -showme:incdirs and -showme:libdirs as well,
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# so grab that while we're at it.
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execute_process(
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COMMAND ${MPI_${lang}_COMPILER} -showme:incdirs
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OUTPUT_VARIABLE MPI_INCDIRS OUTPUT_STRIP_TRAILING_WHITESPACE
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ERROR_VARIABLE MPI_INCDIRS ERROR_STRIP_TRAILING_WHITESPACE)
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execute_process(
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COMMAND ${MPI_${lang}_COMPILER} -showme:libdirs
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OUTPUT_VARIABLE MPI_LIBDIRS OUTPUT_STRIP_TRAILING_WHITESPACE
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ERROR_VARIABLE MPI_LIBDIRS ERROR_STRIP_TRAILING_WHITESPACE)
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else()
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# reset things here if something went wrong.
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set(MPI_COMPILE_CMDLINE)
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set(MPI_LINK_CMDLINE)
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endif()
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endif ()
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# Older versions of LAM-MPI have "-showme". Try to find that.
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if (NOT MPI_COMPILER_RETURN EQUAL 0)
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_mpi_check_compiler("${MPI_${lang}_COMPILER}" "-showme" MPI_COMPILE_CMDLINE MPI_COMPILER_RETURN)
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endif()
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# MVAPICH uses -compile-info and -link-info. Try them.
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if (NOT MPI_COMPILER_RETURN EQUAL 0)
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_mpi_check_compiler("${MPI_${lang}_COMPILER}" "-compile-info" MPI_COMPILE_CMDLINE MPI_COMPILER_RETURN)
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# If we have compile-info, also have link-info.
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if (MPI_COMPILER_RETURN EQUAL 0)
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execute_process(
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COMMAND ${MPI_${lang}_COMPILER} -link-info
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OUTPUT_VARIABLE MPI_LINK_CMDLINE OUTPUT_STRIP_TRAILING_WHITESPACE
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ERROR_VARIABLE MPI_LINK_CMDLINE ERROR_STRIP_TRAILING_WHITESPACE
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RESULT_VARIABLE MPI_COMPILER_RETURN)
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endif()
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# make sure we got compile and link. Reset vars if something's wrong.
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if (NOT MPI_COMPILER_RETURN EQUAL 0)
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set(MPI_COMPILE_CMDLINE)
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set(MPI_LINK_CMDLINE)
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endif()
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endif()
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# MPICH just uses "-show". Try it.
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if (NOT MPI_COMPILER_RETURN EQUAL 0)
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_mpi_check_compiler("${MPI_${lang}_COMPILER}" "-show" MPI_COMPILE_CMDLINE MPI_COMPILER_RETURN)
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endif()
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if (MPI_COMPILER_RETURN EQUAL 0)
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# We have our command lines, but we might need to copy MPI_COMPILE_CMDLINE
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# into MPI_LINK_CMDLINE, if we didn't find the link line.
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if (NOT MPI_LINK_CMDLINE)
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set(MPI_LINK_CMDLINE ${MPI_COMPILE_CMDLINE})
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endif()
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else()
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message(STATUS "Unable to determine MPI from MPI driver ${MPI_${lang}_COMPILER}")
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set(MPI_COMPILE_CMDLINE)
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set(MPI_LINK_CMDLINE)
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endif()
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# Here, we're done with the interrogation part, and we'll try to extract args we care
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# about from what we learned from the compiler wrapper scripts.
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# If interrogation came back with something, extract our variable from the MPI command line
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if (MPI_COMPILE_CMDLINE OR MPI_LINK_CMDLINE)
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# Extract compile flags from the compile command line.
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string(REGEX MATCHALL "(^| )-[Df]([^\" ]+|\"[^\"]+\")" MPI_ALL_COMPILE_FLAGS "${MPI_COMPILE_CMDLINE}")
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set(MPI_COMPILE_FLAGS_WORK)
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foreach(FLAG ${MPI_ALL_COMPILE_FLAGS})
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if (MPI_COMPILE_FLAGS_WORK)
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set(MPI_COMPILE_FLAGS_WORK "${MPI_COMPILE_FLAGS_WORK} ${FLAG}")
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else()
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set(MPI_COMPILE_FLAGS_WORK ${FLAG})
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endif()
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endforeach()
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# Extract include paths from compile command line
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string(REGEX MATCHALL "(^| )-I([^\" ]+|\"[^\"]+\")" MPI_ALL_INCLUDE_PATHS "${MPI_COMPILE_CMDLINE}")
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foreach(IPATH ${MPI_ALL_INCLUDE_PATHS})
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string(REGEX REPLACE "^ ?-I" "" IPATH ${IPATH})
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string(REPLACE "//" "/" IPATH ${IPATH})
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list(APPEND MPI_INCLUDE_PATH_WORK ${IPATH})
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endforeach()
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# try using showme:incdirs if extracting didn't work.
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if (NOT MPI_INCLUDE_PATH_WORK)
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set(MPI_INCLUDE_PATH_WORK ${MPI_INCDIRS})
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separate_arguments(MPI_INCLUDE_PATH_WORK)
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endif()
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# If all else fails, just search for mpi.h in the normal include paths.
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if (NOT MPI_INCLUDE_PATH_WORK)
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set(MPI_HEADER_PATH "MPI_HEADER_PATH-NOTFOUND" CACHE FILEPATH "Cleared" FORCE)
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find_path(MPI_HEADER_PATH mpi.h
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HINTS ${_MPI_BASE_DIR} ${_MPI_PREFIX_PATH}
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PATH_SUFFIXES include)
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set(MPI_INCLUDE_PATH_WORK ${MPI_HEADER_PATH})
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endif()
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# Extract linker paths from the link command line
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string(REGEX MATCHALL "(^| |-Wl,)-L([^\" ]+|\"[^\"]+\")" MPI_ALL_LINK_PATHS "${MPI_LINK_CMDLINE}")
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set(MPI_LINK_PATH)
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foreach(LPATH ${MPI_ALL_LINK_PATHS})
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string(REGEX REPLACE "^(| |-Wl,)-L" "" LPATH ${LPATH})
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string(REPLACE "//" "/" LPATH ${LPATH})
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list(APPEND MPI_LINK_PATH ${LPATH})
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endforeach()
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# try using showme:libdirs if extracting didn't work.
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if (NOT MPI_LINK_PATH)
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set(MPI_LINK_PATH ${MPI_LIBDIRS})
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separate_arguments(MPI_LINK_PATH)
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endif()
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# Extract linker flags from the link command line
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string(REGEX MATCHALL "(^| )-Wl,([^\" ]+|\"[^\"]+\")" MPI_ALL_LINK_FLAGS "${MPI_LINK_CMDLINE}")
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set(MPI_LINK_FLAGS_WORK)
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foreach(FLAG ${MPI_ALL_LINK_FLAGS})
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if (MPI_LINK_FLAGS_WORK)
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set(MPI_LINK_FLAGS_WORK "${MPI_LINK_FLAGS_WORK} ${FLAG}")
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else()
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set(MPI_LINK_FLAGS_WORK ${FLAG})
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endif()
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endforeach()
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# Extract the set of libraries to link against from the link command
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# line
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string(REGEX MATCHALL "(^| )-l([^\" ]+|\"[^\"]+\")" MPI_LIBNAMES "${MPI_LINK_CMDLINE}")
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# add the compiler implicit directories because some compilers
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# such as the intel compiler have libraries that show up
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# in the showme list that can only be found in the implicit
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# link directories of the compiler.
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if (DEFINED CMAKE_${lang}_IMPLICIT_LINK_DIRECTORIES)
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set(MPI_LINK_PATH
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"${MPI_LINK_PATH};${CMAKE_${lang}_IMPLICIT_LINK_DIRECTORIES}")
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endif ()
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# Determine full path names for all of the libraries that one needs
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# to link against in an MPI program
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foreach(LIB ${MPI_LIBNAMES})
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string(REGEX REPLACE "^ ?-l" "" LIB ${LIB})
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# MPI_LIB is cached by find_library, but we don't want that. Clear it first.
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set(MPI_LIB "MPI_LIB-NOTFOUND" CACHE FILEPATH "Cleared" FORCE)
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find_library(MPI_LIB NAMES ${LIB} HINTS ${MPI_LINK_PATH})
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if (MPI_LIB)
|
|
list(APPEND MPI_LIBRARIES_WORK ${MPI_LIB})
|
|
elseif (NOT MPI_FIND_QUIETLY)
|
|
message(WARNING "Unable to find MPI library ${LIB}")
|
|
endif()
|
|
endforeach()
|
|
|
|
# Sanity check MPI_LIBRARIES to make sure there are enough libraries
|
|
list(LENGTH MPI_LIBRARIES_WORK MPI_NUMLIBS)
|
|
list(LENGTH MPI_LIBNAMES MPI_NUMLIBS_EXPECTED)
|
|
if (NOT MPI_NUMLIBS EQUAL MPI_NUMLIBS_EXPECTED)
|
|
set(MPI_LIBRARIES_WORK "MPI_${lang}_LIBRARIES-NOTFOUND")
|
|
endif()
|
|
endif()
|
|
|
|
elseif(try_libs)
|
|
# If we didn't have an MPI compiler script to interrogate, attempt to find everything
|
|
# with plain old find functions. This is nasty because MPI implementations have LOTS of
|
|
# different library names, so this section isn't going to be very generic. We need to
|
|
# make sure it works for MS MPI, though, since there are no compiler wrappers for that.
|
|
find_path(MPI_HEADER_PATH mpi.h
|
|
HINTS ${_MPI_BASE_DIR} ${_MPI_PREFIX_PATH}
|
|
PATH_SUFFIXES include Inc)
|
|
set(MPI_INCLUDE_PATH_WORK ${MPI_HEADER_PATH})
|
|
|
|
# Decide between 32-bit and 64-bit libraries for Microsoft's MPI
|
|
if("${CMAKE_SIZEOF_VOID_P}" EQUAL 8)
|
|
set(MS_MPI_ARCH_DIR amd64)
|
|
else()
|
|
set(MS_MPI_ARCH_DIR i386)
|
|
endif()
|
|
|
|
set(MPI_LIB "MPI_LIB-NOTFOUND" CACHE FILEPATH "Cleared" FORCE)
|
|
find_library(MPI_LIB
|
|
NAMES mpi mpich mpich2 msmpi
|
|
HINTS ${_MPI_BASE_DIR} ${_MPI_PREFIX_PATH}
|
|
PATH_SUFFIXES lib lib/${MS_MPI_ARCH_DIR} Lib Lib/${MS_MPI_ARCH_DIR})
|
|
set(MPI_LIBRARIES_WORK ${MPI_LIB})
|
|
|
|
# Right now, we only know about the extra libs for C++.
|
|
# We could add Fortran here (as there is usually libfmpich, etc.), but
|
|
# this really only has to work with MS MPI on Windows.
|
|
# Assume that other MPI's are covered by the compiler wrappers.
|
|
if (${lang} STREQUAL CXX)
|
|
set(MPI_LIB "MPI_LIB-NOTFOUND" CACHE FILEPATH "Cleared" FORCE)
|
|
find_library(MPI_LIB
|
|
NAMES mpi++ mpicxx cxx mpi_cxx
|
|
HINTS ${_MPI_BASE_DIR} ${_MPI_PREFIX_PATH}
|
|
PATH_SUFFIXES lib)
|
|
if (MPI_LIBRARIES_WORK AND MPI_LIB)
|
|
list(APPEND MPI_LIBRARIES_WORK ${MPI_LIB})
|
|
endif()
|
|
endif()
|
|
|
|
if (NOT MPI_LIBRARIES_WORK)
|
|
set(MPI_LIBRARIES_WORK "MPI_${lang}_LIBRARIES-NOTFOUND")
|
|
endif()
|
|
endif()
|
|
|
|
# If we found MPI, set up all of the appropriate cache entries
|
|
set(MPI_${lang}_COMPILE_FLAGS ${MPI_COMPILE_FLAGS_WORK} CACHE STRING "MPI ${lang} compilation flags" FORCE)
|
|
set(MPI_${lang}_INCLUDE_PATH ${MPI_INCLUDE_PATH_WORK} CACHE STRING "MPI ${lang} include path" FORCE)
|
|
set(MPI_${lang}_LINK_FLAGS ${MPI_LINK_FLAGS_WORK} CACHE STRING "MPI ${lang} linking flags" FORCE)
|
|
set(MPI_${lang}_LIBRARIES ${MPI_LIBRARIES_WORK} CACHE STRING "MPI ${lang} libraries to link against" FORCE)
|
|
mark_as_advanced(MPI_${lang}_COMPILE_FLAGS MPI_${lang}_INCLUDE_PATH MPI_${lang}_LINK_FLAGS MPI_${lang}_LIBRARIES)
|
|
|
|
# clear out our temporary lib/header detectionv variable here.
|
|
set(MPI_LIB "MPI_LIB-NOTFOUND" CACHE INTERNAL "Scratch variable for MPI lib detection" FORCE)
|
|
set(MPI_HEADER_PATH "MPI_HEADER_PATH-NOTFOUND" CACHE INTERNAL "Scratch variable for MPI header detection" FORCE)
|
|
endif()
|
|
|
|
# finally set a found variable for each MPI language
|
|
if (MPI_${lang}_INCLUDE_PATH AND MPI_${lang}_LIBRARIES)
|
|
set(MPI_${lang}_FOUND TRUE PARENT_SCOPE)
|
|
else()
|
|
set(MPI_${lang}_FOUND FALSE PARENT_SCOPE)
|
|
endif()
|
|
endfunction()
|
|
|
|
|
|
# This function attempts to compile with the regular compiler, to see if MPI programs
|
|
# work with it. This is a last ditch attempt after we've tried interrogating mpicc and
|
|
# friends, and after we've tried to find generic libraries. Works on machines like
|
|
# Cray XE6, where the modules environment changes what MPI version cc, CC, and ftn use.
|
|
function(try_regular_compiler lang success)
|
|
set(scratch_directory ${CMAKE_CURRENT_BINARY_DIR}${CMAKE_FILES_DIRECTORY})
|
|
if (${lang} STREQUAL Fortran)
|
|
set(test_file ${scratch_directory}/cmake_mpi_test.f90)
|
|
file(WRITE ${test_file}
|
|
"program hello\n"
|
|
"include 'mpif.h'\n"
|
|
"integer ierror\n"
|
|
"call MPI_INIT(ierror)\n"
|
|
"call MPI_FINALIZE(ierror)\n"
|
|
"end\n")
|
|
else()
|
|
if (${lang} STREQUAL CXX)
|
|
set(test_file ${scratch_directory}/cmake_mpi_test.cpp)
|
|
else()
|
|
set(test_file ${scratch_directory}/cmake_mpi_test.c)
|
|
endif()
|
|
file(WRITE ${test_file}
|
|
"#include <mpi.h>\n"
|
|
"int main(int argc, char **argv) {\n"
|
|
" MPI_Init(&argc, &argv);\n"
|
|
" MPI_Finalize();\n"
|
|
"}\n")
|
|
endif()
|
|
try_compile(compiler_has_mpi ${scratch_directory} ${test_file})
|
|
if (compiler_has_mpi)
|
|
set(MPI_${lang}_NO_INTERROGATE ${CMAKE_${lang}_COMPILER} CACHE STRING "Whether to interrogate MPI ${lang} compiler" FORCE)
|
|
set(MPI_${lang}_COMPILER ${CMAKE_${lang}_COMPILER} CACHE STRING "MPI ${lang} compiler" FORCE)
|
|
set(MPI_${lang}_COMPILE_FLAGS "" CACHE STRING "MPI ${lang} compilation flags" FORCE)
|
|
set(MPI_${lang}_INCLUDE_PATH "" CACHE STRING "MPI ${lang} include path" FORCE)
|
|
set(MPI_${lang}_LINK_FLAGS "" CACHE STRING "MPI ${lang} linking flags" FORCE)
|
|
set(MPI_${lang}_LIBRARIES "" CACHE STRING "MPI ${lang} libraries to link against" FORCE)
|
|
endif()
|
|
set(${success} ${compiler_has_mpi} PARENT_SCOPE)
|
|
unset(compiler_has_mpi CACHE)
|
|
endfunction()
|
|
|
|
# End definitions, commence real work here.
|
|
|
|
# Most mpi distros have some form of mpiexec which gives us something we can reliably look for.
|
|
find_program(MPIEXEC
|
|
NAMES ${_MPI_EXEC_NAMES}
|
|
HINTS ${MPI_HOME} $ENV{MPI_HOME}
|
|
PATHS ${_MPI_PREFIX_PATH}
|
|
PATH_SUFFIXES bin
|
|
DOC "Executable for running MPI programs.")
|
|
|
|
# call get_filename_component twice to remove mpiexec and the directory it exists in (typically bin).
|
|
# This gives us a fairly reliable base directory to search for /bin /lib and /include from.
|
|
get_filename_component(_MPI_BASE_DIR "${MPIEXEC}" PATH)
|
|
get_filename_component(_MPI_BASE_DIR "${_MPI_BASE_DIR}" PATH)
|
|
|
|
set(MPIEXEC_NUMPROC_FLAG "-np" CACHE STRING "Flag used by MPI to specify the number of processes for MPIEXEC; the next option will be the number of processes.")
|
|
set(MPIEXEC_PREFLAGS "" CACHE STRING "These flags will be directly before the executable that is being run by MPIEXEC.")
|
|
set(MPIEXEC_POSTFLAGS "" CACHE STRING "These flags will come after all flags given to MPIEXEC.")
|
|
set(MPIEXEC_MAX_NUMPROCS "2" CACHE STRING "Maximum number of processors available to run MPI applications.")
|
|
mark_as_advanced(MPIEXEC MPIEXEC_NUMPROC_FLAG MPIEXEC_PREFLAGS MPIEXEC_POSTFLAGS MPIEXEC_MAX_NUMPROCS)
|
|
|
|
|
|
#=============================================================================
|
|
# Backward compatibility input hacks. Propagate the FindMPI hints to C and
|
|
# CXX if the respective new versions are not defined. Translate the old
|
|
# MPI_LIBRARY and MPI_EXTRA_LIBRARY to respective MPI_${lang}_LIBRARIES.
|
|
#
|
|
# Once we find the new variables, we translate them back into their old
|
|
# equivalents below.
|
|
foreach (lang C CXX)
|
|
# Old input variables.
|
|
set(_MPI_OLD_INPUT_VARS COMPILER COMPILE_FLAGS INCLUDE_PATH LINK_FLAGS)
|
|
|
|
# Set new vars based on their old equivalents, if the new versions are not already set.
|
|
foreach (var ${_MPI_OLD_INPUT_VARS})
|
|
if (NOT MPI_${lang}_${var} AND MPI_${var})
|
|
set(MPI_${lang}_${var} "${MPI_${var}}")
|
|
endif()
|
|
endforeach()
|
|
|
|
# Special handling for MPI_LIBRARY and MPI_EXTRA_LIBRARY, which we nixed in the
|
|
# new FindMPI. These need to be merged into MPI_<lang>_LIBRARIES
|
|
if (NOT MPI_${lang}_LIBRARIES AND (MPI_LIBRARY OR MPI_EXTRA_LIBRARY))
|
|
set(MPI_${lang}_LIBRARIES ${MPI_LIBRARY} ${MPI_EXTRA_LIBRARY})
|
|
endif()
|
|
endforeach()
|
|
#=============================================================================
|
|
|
|
|
|
# This loop finds the compilers and sends them off for interrogation.
|
|
foreach (lang C CXX Fortran)
|
|
if (CMAKE_${lang}_COMPILER_WORKS)
|
|
# If the user supplies a compiler *name* instead of an absolute path, assume that we need to find THAT compiler.
|
|
if (MPI_${lang}_COMPILER)
|
|
is_file_executable(MPI_${lang}_COMPILER MPI_COMPILER_IS_EXECUTABLE)
|
|
if (NOT MPI_COMPILER_IS_EXECUTABLE)
|
|
# Get rid of our default list of names and just search for the name the user wants.
|
|
set(_MPI_${lang}_COMPILER_NAMES ${MPI_${lang}_COMPILER})
|
|
set(MPI_${lang}_COMPILER "MPI_${lang}_COMPILER-NOTFOUND" CACHE FILEPATH "Cleared" FORCE)
|
|
# If the user specifies a compiler, we don't want to try to search libraries either.
|
|
set(try_libs FALSE)
|
|
endif()
|
|
else()
|
|
set(try_libs TRUE)
|
|
endif()
|
|
|
|
find_program(MPI_${lang}_COMPILER
|
|
NAMES ${_MPI_${lang}_COMPILER_NAMES}
|
|
HINTS ${_MPI_BASE_DIR}/bin
|
|
PATHS ${_MPI_PREFIX_PATH}
|
|
)
|
|
interrogate_mpi_compiler(${lang} ${try_libs})
|
|
mark_as_advanced(MPI_${lang}_COMPILER)
|
|
|
|
# last ditch try -- if nothing works so far, just try running the regular compiler and
|
|
# see if we can create an MPI executable.
|
|
set(regular_compiler_worked 0)
|
|
if (NOT MPI_${lang}_LIBRARIES OR NOT MPI_${lang}_INCLUDE_PATH)
|
|
try_regular_compiler(${lang} regular_compiler_worked)
|
|
endif()
|
|
|
|
set(MPI_${lang}_FIND_QUIETLY ${MPI_FIND_QUIETLY})
|
|
set(MPI_${lang}_FIND_REQUIRED ${MPI_FIND_REQUIRED})
|
|
set(MPI_${lang}_FIND_VERSION ${MPI_FIND_VERSION})
|
|
set(MPI_${lang}_FIND_VERSION_EXACT ${MPI_FIND_VERSION_EXACT})
|
|
|
|
if (regular_compiler_worked)
|
|
find_package_handle_standard_args(MPI_${lang} DEFAULT_MSG MPI_${lang}_COMPILER)
|
|
else()
|
|
find_package_handle_standard_args(MPI_${lang} DEFAULT_MSG MPI_${lang}_LIBRARIES MPI_${lang}_INCLUDE_PATH)
|
|
endif()
|
|
endif()
|
|
endforeach()
|
|
|
|
|
|
#=============================================================================
|
|
# More backward compatibility stuff
|
|
#
|
|
# Bare MPI sans ${lang} vars are set to CXX then C, depending on what was found.
|
|
# This mimics the behavior of the old language-oblivious FindMPI.
|
|
set(_MPI_OLD_VARS FOUND COMPILER INCLUDE_PATH COMPILE_FLAGS LINK_FLAGS LIBRARIES)
|
|
if (MPI_CXX_FOUND)
|
|
foreach (var ${_MPI_OLD_VARS})
|
|
set(MPI_${var} ${MPI_CXX_${var}})
|
|
endforeach()
|
|
elseif (MPI_C_FOUND)
|
|
foreach (var ${_MPI_OLD_VARS})
|
|
set(MPI_${var} ${MPI_C_${var}})
|
|
endforeach()
|
|
else()
|
|
# Note that we might still have found Fortran, but you'll need to use MPI_Fortran_FOUND
|
|
set(MPI_FOUND FALSE)
|
|
endif()
|
|
|
|
# Chop MPI_LIBRARIES into the old-style MPI_LIBRARY and MPI_EXTRA_LIBRARY, and set them in cache.
|
|
if (MPI_LIBRARIES)
|
|
list(GET MPI_LIBRARIES 0 MPI_LIBRARY_WORK)
|
|
set(MPI_LIBRARY ${MPI_LIBRARY_WORK} CACHE FILEPATH "MPI library to link against" FORCE)
|
|
else()
|
|
set(MPI_LIBRARY "MPI_LIBRARY-NOTFOUND" CACHE FILEPATH "MPI library to link against" FORCE)
|
|
endif()
|
|
|
|
list(LENGTH MPI_LIBRARIES MPI_NUMLIBS)
|
|
if (MPI_NUMLIBS GREATER 1)
|
|
set(MPI_EXTRA_LIBRARY_WORK ${MPI_LIBRARIES})
|
|
list(REMOVE_AT MPI_EXTRA_LIBRARY_WORK 0)
|
|
set(MPI_EXTRA_LIBRARY ${MPI_EXTRA_LIBRARY_WORK} CACHE STRING "Extra MPI libraries to link against" FORCE)
|
|
else()
|
|
set(MPI_EXTRA_LIBRARY "MPI_EXTRA_LIBRARY-NOTFOUND" CACHE STRING "Extra MPI libraries to link against" FORCE)
|
|
endif()
|
|
#=============================================================================
|
|
|
|
# unset these vars to cleanup namespace
|
|
unset(_MPI_OLD_VARS)
|
|
unset(_MPI_PREFIX_PATH)
|
|
unset(_MPI_BASE_DIR)
|
|
foreach (lang C CXX Fortran)
|
|
unset(_MPI_${lang}_COMPILER_NAMES)
|
|
endforeach()
|